Gate drive resistor question.
- From: seegoon99@xxxxxxxxx
- Date: Wed, 23 Jan 2008 01:32:58 -0800 (PST)
Hi to all.
I have been asked to look into a SMPS that is experiencing a higher
than wanted failure
rate in the field.Something that I've come across is ringing a bell.
The controller chip (NCP1207)
is driving a fet(IRFBE30) via a 47R resistor. The resistor is an 0805
smt package.
Somewhere on this group in the past I've read something about gate
resistors failing because
they are under sized.(power wise)
Is this possible in this case with such a small package. If the gate
resistor goes high impedance
it would obviously cause catastrophic failure of the FET and then
surrounding components.
Which is what we are seeing.
Could this be an issue?
Cheers
Rob
.
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